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9-1.Fluid Mechanics
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If the terminal speed of a sphere of gold (density $\ =\ 19.5 × 10^3\ kg/m^3$ ) is $0.2\ m/s$ in a viscous liquid (density $\ =\ 1.5 × 10^3\ kg/m^3$ ), find the terminal speed of a sphere of silver (density $\ =\ 10.5 × 10^3\ kg/m^3$ ) of the same size in the same liquid ....... $m/s$
A
$4$
B
$0.133$
C
$0.1$
D
$0.2$
Solution
${V_T}\ \alpha \left( {\rho – {\rho _L}} \right)$
$\frac{{0.2}}{{{V_T}}} = \frac{{18}}{9} \Rightarrow {v_T}\, = \,0.1\,m/s$
Standard 11
Physics
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